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|
{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.kexec.justdoit;
x = if cfg.nvme then "p" else "";
in {
options = {
kexec.justdoit = {
rootDevice = mkOption {
type = types.str;
default = "/dev/sda";
description = "the root block device that justdoit will nuke from orbit and force nixos onto";
};
bootSize = mkOption {
type = types.int;
default = 256;
description = "size of /boot in mb";
};
bootType = mkOption {
type = types.enum [ "ext4" "vfat" "zfs" ];
default = "ext4";
};
swapSize = mkOption {
type = types.int;
default = 1024;
description = "size of swap in mb";
};
poolName = mkOption {
type = types.str;
default = "tank";
description = "zfs pool name";
};
luksEncrypt = mkOption {
type = types.bool;
default = false;
description = "encrypt all of zfs and swap";
};
uefi = mkOption {
type = types.bool;
default = false;
description = "create a uefi install";
};
nvme = mkOption {
type = types.bool;
default = false;
description = "rootDevice is nvme";
};
};
};
config = let
mkBootTable = {
ext4 = "mkfs.ext4 $NIXOS_BOOT -L NIXOS_BOOT";
vfat = "mkfs.vfat $NIXOS_BOOT -n NIXOS_BOOT";
zfs = "";
};
in lib.mkIf true {
system.build.justdoit = pkgs.writeScriptBin "justdoit" ''
#!${pkgs.stdenv.shell}
set -e
vgchange -a n
wipefs -a ${cfg.rootDevice}
dd if=/dev/zero of=${cfg.rootDevice} bs=512 count=10000
sfdisk ${cfg.rootDevice} <<EOF
label: gpt
device: ${cfg.rootDevice}
unit: sectors
${lib.optionalString (cfg.bootType != "zfs") "1 : size=${toString (2048 * cfg.bootSize)}, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4"}
${lib.optionalString (! cfg.uefi) "4 : size=4096, type=21686148-6449-6E6F-744E-656564454649"}
2 : size=${toString (2048 * cfg.swapSize)}, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F
3 : type=0FC63DAF-8483-4772-8E79-3D69D8477DE4
EOF
${if cfg.luksEncrypt then ''
cryptsetup luksFormat ${cfg.rootDevice}${x}2
cryptsetup open --type luks ${cfg.rootDevice}${x}2 swap
cryptsetup luksFormat ${cfg.rootDevice}${x}3
cryptsetup open --type luks ${cfg.rootDevice}${x}3 root
export ROOT_DEVICE=/dev/mapper/root
export SWAP_DEVICE=/dev/mapper/swap
'' else ''
export ROOT_DEVICE=${cfg.rootDevice}${x}3
export SWAP_DEVICE=${cfg.rootDevice}${x}2
''}
${lib.optionalString (cfg.bootType != "zfs") "export NIXOS_BOOT=${cfg.rootDevice}${x}1"}
mkdir -p /mnt
${mkBootTable.${cfg.bootType}}
mkswap $SWAP_DEVICE -L NIXOS_SWAP
zpool create -o ashift=12 -o altroot=/mnt ${cfg.poolName} $ROOT_DEVICE
zfs create -o mountpoint=legacy ${cfg.poolName}/root
zfs create -o mountpoint=legacy ${cfg.poolName}/home
zfs create -o mountpoint=legacy ${cfg.poolName}/nix
swapon $SWAP_DEVICE
mount -t zfs ${cfg.poolName}/root /mnt/
mkdir /mnt/{home,nix,boot}
mount -t zfs ${cfg.poolName}/home /mnt/home/
mount -t zfs ${cfg.poolName}/nix /mnt/nix/
${lib.optionalString (cfg.bootType != "zfs") "mount $NIXOS_BOOT /mnt/boot/"}
nixos-generate-config --root /mnt/
hostId=$(echo $(head -c4 /dev/urandom | od -A none -t x4))
cp ${./target-config.nix} /mnt/etc/nixos/configuration.nix
cat > /mnt/etc/nixos/generated.nix <<EOF
{ ... }:
{
${if cfg.uefi then ''
boot.loader.grub.efiInstallAsRemovable = true;
boot.loader.grub.efiSupport = true;
boot.loader.grub.device = "nodev";
'' else ''
boot.loader.grub.device = "${cfg.rootDevice}";
''}
networking.hostId = "$hostId"; # required for zfs use
${lib.optionalString cfg.luksEncrypt ''
boot.initrd.luks.devices = [
{ name = "swap"; device = "${cfg.rootDevice}${x}2"; preLVM = true; }
{ name = "root"; device = "${cfg.rootDevice}${x}3"; preLVM = true; }
];
''}
}
EOF
nixos-install
umount /mnt/home /mnt/nix ${lib.optionalString (cfg.bootType != "zfs") "/mnt/boot"} /mnt
zpool export ${cfg.poolName}
swapoff $SWAP_DEVICE
'';
environment.systemPackages = [ config.system.build.justdoit ];
boot.supportedFilesystems = [ "zfs" ];
};
}
|
